Align the types defined in optuna_dashboard/ts to @optuna/types as much as possible

.github/workflows/typescript-tests.yml

@@ -23,9 +23,32 @@ jobs:
         uses: actions/setup-node@v2
         with:
           node-version: '20'
+
       - run: npm install
       - run: npm run lint
 
+  type-check:
+    name: Type checking on optuna-dashboard
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out code
+        uses: actions/checkout@master
+
+      - name: Setup Node
+        uses: actions/setup-node@v2
+        with:
+          node-version: '20'
+
+      - name: Setup tslib
+        run: make tslib
+
+      - name: Type Check
+        working-directory: optuna_dashboard
+        run: |
+          npm install
+          npm run type-check
+
   build:
     name: JS build check
     runs-on: ubuntu-latest

biome.json

@@ -15,7 +15,8 @@
 		"ignore": [
 			"optuna_dashboard/ts/components/PlotlyColorTemplates.ts",
 			"tslib/react/src/components/PlotlyDarkMode.ts",
-			"tslib/**/pkg/*"
+			"tslib/**/pkg/*",
+			"tslib/react/types/*"
 		]
 	},
 	"javascript": {

optuna_dashboard/_serializer.py

@@ -62,7 +62,7 @@
             "type": Literal["FloatDistribution"],
             "low": float,
             "high": float,
-            "step": float,
+            "step": Union[float, None],
             "log": bool,
         },
     )